public async Task <IActionResult> GetChapterStatistics(int courseId, int chapterNumber, [FromQuery] DateTime?date)
{
if (courseId < 1 || chapterNumber < 1)
{
return(BadRequest());
}
var dateUtc = date?.ToUniversalTime();
bool useCache = !(dateUtc.HasValue && DateTime.UtcNow.Subtract(dateUtc.Value).TotalSeconds > CacheTimeInSeconds);
var cacheKey = $"GetChapterStatistics-{courseId}-{chapterNumber}";
ChapterStatisticsModel model;
if (!useCache || !_memoryCache.TryGetValue(cacheKey, out model))
{
try
{
var chapter = await _chapterService.LoadChapterAsync(courseId, chapterNumber);
var chapterStatistics = await _chapterService.GetChapterStatisticsAsync(chapter.Id, dateUtc);
model = _chapterConverter.ToChapterStatisticsModel(chapter, chapterStatistics);
if (useCache)
{
_memoryCache.Set(cacheKey, model, DateTime.Now.AddSeconds(CacheTimeInSeconds));
}
}
catch (DataNotFoundException)
{
return(NotFound());
}
}
return(Ok(model));
}
